caliph (n.)youdaoicibaDictYouDict[caliph 词源字典]
late 14c., from Old French caliphe (12c., also algalife), from Medieval Latin califa, from Arabic khalifa "successor," originally Abu-Bakr, who succeeded Muhammad in the role of leader of the faithful after the prophet's death.[caliph etymology, caliph origin, 英语词源]